转孟子:下面的代码实现从SQL Server数据库提取图片并显示在DataGrid的功能。
下面就是完整的代码，拷贝即可运行：
<%@ Page Language="vb" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<head>
<title>用户列表</title>
<script runat=server>
Sub Page_Load(sender As Object, e As EventArgs)
If Not Page.IsPostBack Then
BindGrid()
End If
End SubPrivate Sub BindGrid()
Dim strCnn As String = "Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;"
Dim myConnection As SqlConnection = New SqlConnection(strCnn)
Dim myCommand As SqlCommand = New SqlCommand("SELECT * FROM Person", myConnection)
myCommand.CommandType = CommandType.Text
Try
myConnection.Open()
DG_Persons.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection)
DG_Persons.DataBind()
Catch SQLexc As SqlException
Response.Write("Error occured while Generating Data. Error is " & SQLexc.ToString())
End Try
End SubFunction FormatURL(strArgument) as String
Return ("ReadImage.aspx?id=" & strArgument)
End Function
</script>
</head>
<body style="font: 9pt 宋体">
<h3 align=center>从数据库中取得照片并显示在DataGrid中</h3>
<form id="Form1" method="post" runat="server">
<asp:DataGrid ID="DG_Persons" AutoGenerateColumns=False Width="99%"
HeaderStyle-BackColor="#ff0000" HeaderStyle-Font-Bold="True" HeaderStyle-ForeColor="#ffffff"
ItemStyle-BackColor=Beige BorderColor="#000000" Runat=server HeaderStyle-HorizontalAlign=Center>
<Columns>
<asp:TemplateColumn HeaderText="姓名">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonName") %>' ID="Label1"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="电子邮件">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonEmail") %>' ID="Label2"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="性别">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonSex") %>' ID="Label3"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="出生日期">
<ItemTemplate>
<asp:Label Runat="server"
Text='<%# DataBinder.Eval(Container.DataItem, "PersonDOB") %>' ID="Label4"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="照片">
<ItemTemplate>
<asp:Image Runat=server ID="Image1" Width="150" Height="125"
ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "PersonID")) %>' />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>ReadImage.aspx<%@ Page Language="vb" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<HTML>
<HEAD>
<script runat=server>
Public Sub Page_Load(sender As Object, e As EventArgs)
Dim strImageID as String = Request.QueryString("id")
Dim myConnection As New SqlConnection("Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;")
Dim myCommand As New SqlCommand("Select PersonImageType, PersonImage from Person Where PersonID=" _
+ strImageID, myConnection) Try
myConnection.Open()
Dim myDataReader as SqlDataReader
myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection)
Do While (myDataReader.Read())
Response.ContentType = myDataReader.Item("PersonImageType")
Response.BinaryWrite(myDataReader.Item("PersonImage"))
Loop
myConnection.Close()
Catch SQLexc As SqlException
End Try
End Sub
</script>
</HEAD>
<body>
<form runat="server" ID="Form1"></form>
</body>
</HTML>
下面就是完整的代码，拷贝即可运行：
<%@ Page Language="vb" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<head>
<title>用户列表</title>
<script runat=server>
Sub Page_Load(sender As Object, e As EventArgs)
If Not Page.IsPostBack Then
BindGrid()
End If
End SubPrivate Sub BindGrid()
Dim strCnn As String = "Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;"
Dim myConnection As SqlConnection = New SqlConnection(strCnn)
Dim myCommand As SqlCommand = New SqlCommand("SELECT * FROM Person", myConnection)
myCommand.CommandType = CommandType.Text
Try
myConnection.Open()
DG_Persons.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection)
DG_Persons.DataBind()
Catch SQLexc As SqlException
Response.Write("Error occured while Generating Data. Error is " & SQLexc.ToString())
End Try
End SubFunction FormatURL(strArgument) as String
Return ("ReadImage.aspx?id=" & strArgument)
End Function
</script>
</head>
<body style="font: 9pt 宋体">
<h3 align=center>从数据库中取得照片并显示在DataGrid中</h3>
<form id="Form1" method="post" runat="server">
<asp:DataGrid ID="DG_Persons" AutoGenerateColumns=False Width="99%"
HeaderStyle-BackColor="#ff0000" HeaderStyle-Font-Bold="True" HeaderStyle-ForeColor="#ffffff"
ItemStyle-BackColor=Beige BorderColor="#000000" Runat=server HeaderStyle-HorizontalAlign=Center>
<Columns>
<asp:TemplateColumn HeaderText="姓名">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonName") %>' ID="Label1"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="电子邮件">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonEmail") %>' ID="Label2"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="性别">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonSex") %>' ID="Label3"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="出生日期">
<ItemTemplate>
<asp:Label Runat="server"
Text='<%# DataBinder.Eval(Container.DataItem, "PersonDOB") %>' ID="Label4"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="照片">
<ItemTemplate>
<asp:Image Runat=server ID="Image1" Width="150" Height="125"
ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "PersonID")) %>' />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>ReadImage.aspx<%@ Page Language="vb" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<HTML>
<HEAD>
<script runat=server>
Public Sub Page_Load(sender As Object, e As EventArgs)
Dim strImageID as String = Request.QueryString("id")
Dim myConnection As New SqlConnection("Data Source=.;Initial Catalog=mxh;User Id=sa;Password=;")
Dim myCommand As New SqlCommand("Select PersonImageType, PersonImage from Person Where PersonID=" _
+ strImageID, myConnection) Try
myConnection.Open()
Dim myDataReader as SqlDataReader
myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection)
Do While (myDataReader.Read())
Response.ContentType = myDataReader.Item("PersonImageType")
Response.BinaryWrite(myDataReader.Item("PersonImage"))
Loop
myConnection.Close()
Catch SQLexc As SqlException
End Try
End Sub
</script>
</HEAD>
<body>
<form runat="server" ID="Form1"></form>
</body>
</HTML>
http://www.codeproject.com/aspnet/NetPix.asp
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Data.SqlClient;namespace WindowsApplication21
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.ComponentModel.IContainer components;
private string ConnectionString = "Integrated Security=SSPI;Initial Catalog=;Data Source=localhost;";
private SqlConnection conn = null;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.PictureBox pic1;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.ImageList imageList1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label2;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
conn = new SqlConnection(ConnectionString); //
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if (conn.State == ConnectionState.Open)
conn.Close();
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing ); } #region Windows Form Designer generated code
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.button1 = new System.Windows.Forms.Button();
this.pic1 = new System.Windows.Forms.PictureBox();
this.button2 = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.label2 = new System.Windows.Forms.Label();
this.imageList1 = new System.Windows.Forms.ImageList(this.components);
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(0, 40);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(264, 48);
this.button1.TabIndex = 0;
this.button1.Text = "加入新的图片";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// pic1
//
this.pic1.Location = new System.Drawing.Point(280, 8);
this.pic1.Name = "pic1";
this.pic1.Size = new System.Drawing.Size(344, 264);
this.pic1.TabIndex = 3;
this.pic1.TabStop = false;
//
// button2
//
this.button2.Location = new System.Drawing.Point(0, 104);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(264, 40);
this.button2.TabIndex = 4;
this.button2.Text = "从数据库中恢复图像";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// openFileDialog1
//
this.openFileDialog1.Filter = "\"图像文件(*.jpg,*.bmp,*.gif)|*.jpg|*.bmp|*.gif\"";
//
// label2
//
this.label2.Location = new System.Drawing.Point(0, 152);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(264, 48);
this.label2.TabIndex = 5;
//
// imageList1
//
this.imageList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(96, 208);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(64, 21);
this.textBox1.TabIndex = 6;
this.textBox1.Text = "";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(632, 445);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.textBox1,
this.label2,
this.button2,
this.pic1,
this.button1});
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void button1_Click(object sender, System.EventArgs e)
{
openFileDialog1.ShowDialog (); if (openFileDialog1.FileName.Trim()!="")
{
FileInfo fi = new FileInfo(openFileDialog1.FileName);
string imgtitle=openFileDialog1.FileName;
int imgdatalen=(int)fi.Length;
byte[] imgdata = new byte[imgdatalen];
Stream imgdatastream=fi.OpenRead();
int n=imgdatastream.Read(imgdata,0,imgdatalen);
if( conn.State == ConnectionState.Open)
conn.Close();
ConnectionString ="Integrated Security=SSPI;" + "Initial Catalog=mydb;" +"Data Source=localhost;";
conn.ConnectionString = ConnectionString;
try
{
string mySelectQuery = "INSERT INTO ImageStore(imgdata) VALUES (@imgdata )";
SqlCommand myCommand = new SqlCommand(mySelectQuery, conn);
SqlParameter paramData = new SqlParameter( "@imgdata", SqlDbType.Image );
paramData.Value = imgdata;
myCommand.Parameters.Add( paramData ); conn.Open();
int numRowsAffected = myCommand.ExecuteNonQuery();
conn.Close(); MessageBox.Show("成功放入图片到数据库中");
}
catch(Exception err)
{
MessageBox.Show("您输入名称可能在数据库中已存在或输入为空，请检查!"+err.ToString() );
}
finally
{}
} } private void button2_Click(object sender, System.EventArgs e)
{
if( conn.State == ConnectionState.Open)
conn.Close();
ConnectionString ="Integrated Security=SSPI;" + "Initial Catalog=mydb;" +"Data Source=localhost;";
conn.ConnectionString = ConnectionString;
string sql="SELECT * FROM ImageStore where id="+textBox1.Text.Trim() ;
SqlCommand command = new SqlCommand(sql, conn);
try
{
conn.Open();
}
catch
{
MessageBox.Show(" 不能打开数据联接!") ;
}
SqlDataReader dr = command.ExecuteReader();
if(dr.Read())
{
byte[] mydata=((byte[])dr["imgdata"]);
MemoryStream myStream=new MemoryStream();
foreach(byte a in mydata)
{
myStream.WriteByte(a);
}
Image myImage=Image.FromStream(myStream);
myStream.Close();
pic1.Image=myImage;
pic1.Refresh();
}
else
{
MessageBox.Show("没有成功读入数据!") ;
}
conn.Close();
}
}
}
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Data.OleDb;
namespace WindowsApplication21
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.ComponentModel.IContainer components;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.PictureBox pic1;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label2;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
base.Dispose( disposing ); } #region Windows Form Designer generated code
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.pic1 = new System.Windows.Forms.PictureBox();
this.button2 = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.label2 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(0, 40);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(264, 48);
this.button1.TabIndex = 0;
this.button1.Text = "加入新的图片";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// pic1
//
this.pic1.Location = new System.Drawing.Point(280, 8);
this.pic1.Name = "pic1";
this.pic1.Size = new System.Drawing.Size(312, 264);
this.pic1.TabIndex = 3;
this.pic1.TabStop = false;
//
// button2
//
this.button2.Location = new System.Drawing.Point(0, 104);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(264, 40);
this.button2.TabIndex = 4;
this.button2.Text = "从数据库中恢复图像";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// openFileDialog1
//
this.openFileDialog1.Filter = "\"图像文件(*.jpg,*.bmp,*.gif)|*.jpg|*.bmp|*.gif\"";
//
// label2
//
this.label2.Location = new System.Drawing.Point(0, 152);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(264, 48);
this.label2.TabIndex = 5;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(96, 208);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(64, 21);
this.textBox1.TabIndex = 6;
this.textBox1.Text = "";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(616, 293);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.textBox1,
this.label2,
this.button2,
this.pic1,
this.button1});
this.Name = "Form1";
this.Text = "读取、写入图像到数据库中(黄海编制)";
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void button1_Click(object sender, System.EventArgs e)
{
openFileDialog1.ShowDialog (); if (openFileDialog1.FileName.Trim()!="")
{
FileInfo fi = new FileInfo(openFileDialog1.FileName);
string imgtitle=openFileDialog1.FileName;
int imgdatalen=(int)fi.Length;
byte[] imgdata = new byte[imgdatalen];
Stream imgdatastream=fi.OpenRead();
int n=imgdatastream.Read(imgdata,0,imgdatalen);
string strCon="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Application.StartupPath+"\\mydb.mdb";
OleDbConnection conn = new OleDbConnection ( strCon ) ;
try
{
string mySelectQuery = "INSERT INTO ImageStore(imgdata) VALUES (@imgdata )";
OleDbCommand myCommand = new OleDbCommand(mySelectQuery, conn); OleDbParameter paramData = new OleDbParameter( "@imgdata", SqlDbType.Image );
paramData.Value = imgdata;
myCommand.Parameters.Add( paramData ); conn.Open();
int numRowsAffected = myCommand.ExecuteNonQuery();
conn.Close(); MessageBox.Show("成功放入图片到数据库中");
}
catch(Exception err)
{
MessageBox.Show("您输入名称可能在数据库中已存在或输入为空，请检查!"+err.ToString() );
}
finally
{}
} }
private void button2_Click(object sender, System.EventArgs e)
{
string strCon="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Application.StartupPath+"\\mydb.mdb";
OleDbConnection conn = new OleDbConnection ( strCon ) ;
if(textBox1.Text.Trim()=="") MessageBox.Show("显示不能为空！");
else
{
string sql="SELECT * FROM ImageStore where id="+textBox1.Text.Trim() ;
OleDbCommand command = new OleDbCommand(sql, conn);
try
{
conn.Open();
}
catch
{
MessageBox.Show(" 不能打开数据联接!") ;
}
OleDbDataReader dr = command.ExecuteReader();
if(dr.Read())
{
byte[] mydata=((byte[])dr["imgdata"]);
MemoryStream myStream=new MemoryStream();
foreach(byte a in mydata)
{
myStream.WriteByte(a);
}
Image myImage=Image.FromStream(myStream);
myStream.Close();
pic1.Image=myImage;
pic1.Refresh();
}
else
{
MessageBox.Show("没有成功读入数据!") ;
}
conn.Close();
}
}
} }